Victoria Azarenka

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Victoria Azarenka of Belarus speaks during a press conference at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 12, 2014. (AP Photo/Shuji Kajiyama)

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Victoria Azarenka of Belarus speaks during a press conference at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 12, 2014. (AP Photo/Shuji Kajiyama)

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Victoria Azarenka of Belarus plays a shot as she holds hands with Switzerland's Roger Federer during an exhibition match on Kids Tennis Day ahead of the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 11, 2014. (AP Photo/Eugene Hoshiko)

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Defending champions Victoria Azarenka of Belarus and Serbia's Novak Djokovic pose with their trophies prior to the the official draw of the Australian Open tennis championship in Melbourne Australia, Friday, Jan. 10, 2014. (AP Photo/Mark Baker)

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Defending champions Victoria Azarenka of Belarus and Serbia's Novak Djokovic pose with their trophies prior to the the official draw of the Australian Open tennis championship in Melbourne Australia, Friday, Jan. 10, 2014. (AP Photo/Mark Baker)

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Defending champions Victoria Azarenka of Belarus and Serbia's Novak Djokovic walk with their trophies prior to the the official draw of the Australian Open tennis championship in Melbourne Australia, Friday, Jan. 10, 2014. (AP Photo/Mark Baker)

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Defending champions Victoria Azarenka of Belarus and Serbia's Novak Djokovic pose with their trophies prior to the official draw of the Australian Open tennis championship in Melbourne Australia, Friday, Jan. 10, 2014. (AP Photo/Aijaz Rahi)